It is the largest reading minus the smallest, divided by the mean, shown as a percentage. The 2% prompt is a practical repeat cue, not a medical threshold.
A practical measurement tool
Measurement consistency check
Check the spread of repeat tape measurements with a transparent non-clinical summary.
Compare repeated tape readings
Take three readings at the same landmark during one session. This checks the spread of entered values, not measurement accuracy or health.
A small spread shows repeatability for this session only. It does not prove that the tape landmark was correct or that a change between weeks is real.
A repeatability check, not an accuracy score
Use the same landmark, tape tension and breathing state. A small spread within one session does not prove the reading is anatomically correct or that a change between dates is real.
FAQ